Sharpening device for lawn-mowers and other articles.



No. 831,183. PATENTED SEPT. 18, 1906.

G. H. PAULUS. SHARPENING DEVICE FOR LAWN MOWBRS AND OTHER ARTICLES.

APPLICATION FILED DEC. 21, 1905 UNITED sTA rEs enonen H. PAULUS, OF DETROIT, nicmenn. SHARPENING DEVICE FOR LAWN-MOWERS AND OTHER AR TlCLESQ Specification of Letters Patent.

Patented Sept. 1s, 1906.

Application filed December 21, 1905. Serial No. 292,819.

Be it known that l, Gnonon I I. PAULus, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful improvement in Sharpening Devices for Lawn Mowers and other Articles, of which the following is a specification, reference being had to the aecmnpanying drawings, which form a part of this specification.

My invention has for its object a sharpening device for lawn-mowers and other-articles; and it consists of the structure hereinafter described and claimed, and illustrated in the accompanying drawings, in which Figure l is a view in cross-section, illustrating my device as applied to the edge of a cutter-bar of a lawn-mower. Fig. 2 is a detail view of the sharpening device in perspective. Fig. 3 is a cross-section through the sharpening device. Fig. 4 is a' view in end elevation, showing the sharpening device in place upon the edge of the cutter-bar of a lawn-mower.

The desirability of a simple, economical, and efficient sharpening-device forthe rcvolving cutter-blades of a lawn-mower is obvious, and whereby the revolving eutten blades may be sharpened evenly and uniformly throughout the entire length of such blades, so as to insure their efficient operation.

Heretofore where the cutting-blades of a lawn-mower have been sharpened by a file there has beengreat liability of filing away the blade more at one extremity than an-. other or at one point more than another, while also different cutter-blades are unevenly sharpened, no two blades being sharpened exactly alike, resulting in the speedy destruction of the machine or rendering the machine useless for further work while only the cutter-blades may be damaged, Whereas if the cutter-blades have been sharpened uniformly and all alike much more Wear could have been obtained from the machine. Practically the same is true where the cutterblades have been sharpened upon a revolving grinding-wheel. Each blade being sharpened separately by itself is liable,

necessitating a throwing of the machine into the junk-pile before its other parts have been much damaged.

'kerf.

the same as Where a file is applied, to be sharpened un- My present invention is designed to avert these difficulties in a simple and elliei'ent manner and to provide means whereby any operator may readily sharpen the revolving cutter-blades of his lawn-mower, and where-v by the blades will be evenly sharpened from end to end, and whereby also the different blades will be uniformly sharpened alike, thereby giving much greater length of life to the machine, increasing its elliciency and length ofservice.

To these ends lily-inventionconsists, essentially, of a sharpener which may be readily attached to the stationary cutter-blade of a lawn-mower.

My improved sharpener is constructed, essentially, of a body a, of any suitable material, hard wood being preferable, the same having been thoroughly seasoned, said body PAT T v0113171611. i i

bein rovided with a kerf or slot indicated at 1),) the kerf being ofsiiflicient width and depth to allow the body to be applied to the edge of the stationary cutter-blade of the mower the ed 'e of the blade OlltOlllW' said l he body thus presents two surfaces,

the one above and the other below the plane of the cutter-blade, the two surfaces of the sharpening device being preferably coated with emery or other suitable abrading or grinding substances, (indicated at 1 While I do not limit myself solely t1: having the two surfaces of the body of the sharpening device form abrading orgrindin'g surfaces, yet it will be economical and prefemble to have both the upper and low i ices of the body provided with abrading-surfaces, as it will be readily apparent that the sharpening device may thus be readily changed from end to end, so as to bring one surface after another into position upon the edge of the cutter-blade to sharpen the revolving cutter-blades. The body of the sharpening de-. vice will be of such thickness as to set above the edge of the blade only a required distance for the revolving cutter-blades to contact therewith in their revolution.

It will be evident that in the revolution of the blades to be sharpened theforce is toward the edge of the stationary cutter-blade, so that as the revolving cutter-blades contact with the sharpening device the tendency is to hold and force the sharpening device firmly in place upon the edge of the stationar cutter-blade, so that there will be no liabi ity of its accidental displacement. The abrading-face of the sharpening device upperis made adjustable.

most will of course be of uniform thickness from end to end, so that the cutter-blades as they contact therewith will be uniformly ground fromend to end andall of the revolving cutter-blades will be rnifcrmly and evenly sharpened.

The unkerfed edge of the. body a is also preferably formed with an a bradingsurface.

It willbe apparent that the sharpening device,

while specially adapted it? application and use upon a lawn-mower, may at the same time be employed for a variety of other uses in the same manner as any ordinary hone or whet stone, so that the device may serve a wide range of ises, its special use being, as above described, for application to the stationary cutter-blade of a lawn-mower, it being only necessary then to revolve the revolving critter-blades to efieet their ec mplet-e sharpening in a simple, ellicient, and economical manner, the operation being so simple that any user of a lawn-mower can readily sharpen his own machine, making it *cnneccssary for him to take his machine to be gro'r nd i It is well understood that the fixed lower cutter-blade d, while staticnary in operation, Its cutting edge may readily be'tilted or dropped away from the revolving cutter-blade e a required distance in order to apply my improved sharpening device thereto for sharpening the revolving cutter-blades.

When the operation of sharpening has been completed, 'the lower cutter-blade is simply adji'sted again in a well-known manner into proper relation with the revolving cutter-blades.

What I claim as my invention is' v 1. A sharpening device for sharpening cutter-blad es of lawn-mowers and for other uses, comprising a body provided with an abrading-surface, and with an open kerf or slot in one edge thereof.

2. A sharpening device for sharpening cutter-blades of lawn-mowers and for other uses, comprising a body provided with an open longitudinally extended kerf in one edge therei f, said body provided with abradingsurfaces on opposite sides of said kerf Whereby the device is reversible for application for sharpening blades of lawn-mowersI 3. A sharpening device for sharpening the rotatable cutter-blades ofa lawn-mower, said sharpening device comprising a single integral body provided with an abrading-surface, and with an open longitudinally-extended kerf or slot in one edge thereof to receive the fixed cutter-blade of the mower.

In testimony whereof I have signed specification in the presence of two subscribing witnesses.

N. S. WRIGHT, A. M. MURPHY this 

